The AT4 (or AT-4) is a portable one-shot anti-tank weapon built in Sweden by Saab Bofors Dynamics (previously Bofors Anti Armour Systems). In the U.S. and NATO inventory it replaces the M72 LAW (Light Anti-armor Weapon). Saab has had considerable sales success with the AT4, making it one of the most common light anti-tank weapons in the world. It is intended to give infantry units a means to destroy or disable armored vehicles and fortifications they may encounter (though it is not generally sufficient to defeat a modern main battle tank). The launcher and projectile are manufactured, pre-packed, and issued as a single unit of ammunition (rather than a weapon system), with the launcher discarded after use.

There are several different projectiles for the AT4. Note that since the AT4 is a one-shot weapon, these projectiles are preloaded.

HEAT (High Explosive Anti Tank):
The AT4 HEAT is a low-trajectory, low-dispersion weapon that can penetrate up to 420 mm of armor.

HEDP (High Explosive Dual Purpose):
For use with bunkers and buildings. The projectile can be set to detonate on impact or with a delayed detonation.

HP (High Penetration):
Extra high penetration ability. Can penetrate 500 to 600 mm armour.